/*******************************************************************************
 *
 * Pentaho Big Data
 *
 * Copyright (C) 2002-2019 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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package org.pentaho.hadoop.shim.api.internal;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Denotes a {@link org.pentaho.hadoop.shim.spi.PentahoHadoopShim} is required to be provided by a Hadoop Configuration.
 * If a Hadoop Configuration does not supply a shim implementation that is required it is not a valid configuration.
 */
@Documented
@Retention( RetentionPolicy.RUNTIME )
public @interface Required {

}
